Ultrasound and Human Ear, Class 9 Science Sample Papers

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying

1. Which waves are employed in SONAR?

  X rays

  Ultrasonic Wave

 Sonar wave

 Infrasonic Wave

Question 1 of 10

2. A ship sends sonar and receives an echo after 2 seconds. If the speed of sound waves in water is 1500 m/s, then the depth of the sea is

 1500 m

 500 m

 750 m

 1000 m

Question 2 of 10

3. The vibrations or the pressure variations inside the inner ear are converted into electrical signals by the:

 Nerves

 Hammer, anvil and stirrup

 Cochlea

  Pinna

Question 3 of 10

4. Which part of the ear amplifies the vibrations of eardrum?

  hammer, anvil and stirrup

 Pinna

 Cochlea

 Auditory nerves

Question 4 of 10

5. Sound of the frequency below 20 Hz is known as

 Infrasonic

 Ultrasonic

 Echo

  Sonar

Question 5 of 10

6. The technique used by bats to find their way or to locate food is

  Flapping

 SONAR

 Echo-location

  RADAR

Question 6 of 10

7. Ultrasound is not used to:

 detect defective foetus.

 find the distance of the building.

 clean spiral tubes.

 as a tool in the treatment of muscular pain.

Question 7 of 10

8. Young children below 5 year can hear up to a frequency of

 25 KHz

 20 KHz

 40 KHz

 30 KHz

Question 8 of 10

9. The velocity of ultrasonic sound in water is 1400 m. The depth of the ocean as detected by SONAR, if the time taken to receive the reflected wave is 15s, is

 1050 m

  105 m

 10.5 km

 21 km

Question 9 of 10

10. A ship on the surface of water sends a signal and receives it back after 4 seconds from a submarine inside the water. Calculate the distance of the submarine from the ship (The speed of sound in water is 1450 m/s).

 290 km

 29 km

 2900 km

 2.9 km

Question 10 of 10

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